1.75
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21/40 cannot be reduced.
Reduced to its most simplified form, 21 over 12 (or 7/4) is "one and three-quarters" 13/4
7.75
2/7 is the most reduced fraction but other equivalent fractions would be... 4/14 6/21 8/28 10/35 12/42 etc...
Expressed as a vulgar fraction in its simplest terms, by dividing both the numerator and denominator by 3, 12/21 is equal to 4/7, or four sevenths.